runtime: disable crash stack on Windows

Apparently, on Windows, throwing an exception on a non-system-
allocated crash stack causes EXCEPTION_STACK_OVERFLOW and hangs
the process (see issue golang#63938). Disable crash stack for now, which
gets us back the the behavior of Go 1.21.

Fixes golang#63938.

Change-Id: I4c090315b93b484e756b242f0de7a9e02f199261
Reviewed-on: https://go-review.googlesource.com/c/go/+/543996
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>

Author: cherrymui

src/runtime/crash_test.go

@@ -795,14 +795,12 @@ func TestG0StackOverflow(t *testing.T) {
 	if runtime.GOOS == "ios" {
 		testenv.SkipFlaky(t, 62671)
 	}
-	if runtime.GOOS == "windows" && runtime.GOARCH == "arm64" {
-		testenv.SkipFlaky(t, 63938) // TODO(cherry): fix and unskip
-	}
 
 	if os.Getenv("TEST_G0_STACK_OVERFLOW") != "1" {
 		cmd := testenv.CleanCmdEnv(testenv.Command(t, os.Args[0], "-test.run=^TestG0StackOverflow$", "-test.v"))
 		cmd.Env = append(cmd.Env, "TEST_G0_STACK_OVERFLOW=1")
 		out, err := cmd.CombinedOutput()
+		t.Logf("output:\n%s", out)
 		// Don't check err since it's expected to crash.
 		if n := strings.Count(string(out), "morestack on g0\n"); n != 1 {
 			t.Fatalf("%s\n(exit status %v)", out, err)

src/runtime/proc.go

@@ -576,7 +576,10 @@ func switchToCrashStack(fn func()) {
 	abort()
 }
 
-const crashStackImplemented = GOARCH == "amd64" || GOARCH == "arm64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "wasm"
+// Disable crash stack on Windows for now. Apparently, throwing an exception
+// on a non-system-allocated crash stack causes EXCEPTION_STACK_OVERFLOW and
+// hangs the process (see issue 63938).
+const crashStackImplemented = (GOARCH == "amd64" || GOARCH == "arm64" || GOARCH == "mips64" || GOARCH == "mips64le" || GOARCH == "ppc64" || GOARCH == "ppc64le" || GOARCH == "riscv64" || GOARCH == "wasm") && GOOS != "windows"
 
 //go:noescape
 func switchToCrashStack0(fn func()) // in assembly